Recently I have been having some problems when playing music through headphones. The problems happen no matter which music app I am using (I have tried 4 or 5) Firstly every now and then it will stop playing randomly when the phone is locked ( i think this might be a problem with the jack but not 100%). Secondly and a bigger problem is that when the music app is running my phone will randomly start to ring the last person that called my phone, this happens when flicking through songs on the app also when locked and playing music. Any ideas on what is causing it? first problem isnt too bad but the second is starting to become very inconvenient. Help will be much appreciated.